Hiding your license plate will almost always be considered an offense, but is it one cops actively care about? Luckily in my state I vary rarely see cops on the road making my risk much lower. In the case of getting pulled over, its a $75 dollar fee in Colorado that I am happy to pay, it won't change my behavior.

You can also leave your cell phone at home. Disable anything broadcasting from your vehicle, like bluetooth, wifi, and onboard cell connectivity for telematics. Remove the RFID chips on your car rims (assuming you have a recent model vehicle). Remove TPM sensors from your wheels (A lot of them have part of your vehicle VIN in the packets). Tint your car windows... and remove anything that is unique, like stickers off your vehicle. Partially are completely block your license plate from being read by ALPR's.

Do all of those and you're not as trackable as you are not doing them today.

It doesn't.

It just means that they've not gone at a speed sufficiently egregious for a detective to be handed the packet to work out the vehicle's true identity.